Portable test instrument



FIG. 1 is a perspective view of a portable test instrument showing the new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left-side elevation view thereof;

FIG. 5 is a right-side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown are included for the purpose of illustrating portions of the portable test instrument that form no part of the claim. 

CLAIM The ornamental design for a portable test instrument, as shown and described. 